noteable quote

multiple followers

Now let’s look at example that is a bit more complicated.
In this example there are five activities who do not share
the same set of prior activities. Special care must be taken
to understand the purpose of the backward pass when such a
situation is encountered. Remember that the purpose of the
backward pass is to determine the latest that an activity
can finish (or start) without impacting the overall project.
When there is a question about which possible late finish
time for a given activity should be selected, the earliest
time, is therefore, the choice.

As before start the backward pass by finding the project
end time and setting that late finish time of all ending
activities as the late finish time of all latest activities.
In a real schedule, we should have a single “end job” activity,
but in this case we will find the latest finish time and copy
it over to the late finish times of the ending activities as
shown in the diagram below.

Now we can calculate the late start times of each of these
three ending activities. The resulting arithmetic is shown in
the figure below.

Given that there are multiple possible late finish
times for Activities A and B, we have to decide which one
to select. According to our rule we select the earliest of
the incoming Late Finish Times. This is shown in the figure below.

Finally we can complete the backward pass calculation
for Activity A and Activity B as shown in the following figure.